If you had a time machine and your broomstick, you'd wind up being burnt at the stake as a witch by people who didn't have a Bill of Rights restricting their abilities to kill someone because of their religion.

Oh, wait a minute... You said "boomstick", not "broomstick". In that case:

If you had a time machine and your boomstick, you'd wind up being thrown in prison for a very long time by people who didn't have a Bill of Rights restricting their abilities to imprison someone because he owned a gun. Depending on how far back you went, they might burn you at the stake later for having a magic boomstick.

Be glad you're not Dr. Who. I often wondered how he did it. But he had, like, a dozen lives, didn't he?

Regards--
Mary Anne